/*
 * Copyright 2025 coze-dev Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { useMemo } from 'react';

import { getSearchValue } from '../../shared';
import { type ExpressionEditorTreeNode } from '../../core';
import { type CompletionContext } from './types';

function useFilteredVariableTree(
  context: CompletionContext | undefined,
  drilledVariableTree: ExpressionEditorTreeNode[],
) {
  return useMemo(() => {
    if (!drilledVariableTree) {
      return [];
    }

    if (!context) {
      return drilledVariableTree;
    }

    const searchValue = getSearchValue(context.textBefore);

    return drilledVariableTree.filter(variable =>
      variable.label.startsWith(searchValue),
    );
  }, [context, drilledVariableTree]);
}

export { useFilteredVariableTree };
